Kovacs, Judith
BlackWell Publishing, 2004
Buku Teks
Hasbullah Kasim Bakry
Widjaya, 1970
Buku Teks
Markos, Ni
Institute of Linguistics Philippine, 1966
Buku Teks
Stead, Christina
Angus and Robertson, 1988
Buku Teks
edited by W.M. Geddie and J. Liddell Geddie
W&R Chambers, 1949
Buku Referensi